During meiosis, crossover recombination is essential to link homologous chromosomes and drive 22 faithful chromosome segregation. Crossover recombination is non-random across the genome, 23 and centromere-proximal crossovers are associated with an increased risk of aneuploidy, 24 including Trisomy 21 in humans. Here, we identify the conserved Ctf19/CCAN kinetochore sub- 25 complex as a major factor that minimizes potentially deleterious centromere-proximal crossovers 26 in budding yeast. We uncover multi-layered suppression of pericentromeric recombination by the 27 Ctf19 complex, operating across distinct chromosomal distances. The Ctf19 complex prevents 28 meiotic DNA break formation, the initiating event of recombination, proximal to the centromere. 29 The Ctf19 complex independently drives the enrichment of cohesin throughout the broader 30 pericentromere to suppress crossovers, but not DNA breaks. This non-canonical role of the 31 kinetochore in defining a chromosome domain that is refractory to crossovers adds a new layer 32 of functionality by which the kinetochore prevents the incidence of chromosome segregation 33 errors that generate aneuploid gametes.

eLife_Dryad_Recombine_dataanalysis files from the Recombine software for clb2-iml3 tetrads